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mutter-performance-source/clutter/clutter-input-device.c
Jonas Ådahl a182d4befa ClutterInputDevice: Store the cursor coordinate state as floating point 
To support sub-pixel motion events coming from relative events, the
fraction part needs to be stored in the input device state as well. To
do this, simply change the current type from gint to gfloat.

https://bugzilla.gnome.org/show_bug.cgi?id=736413
2014-09-14 16:58:27 +02:00

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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Copyright © 2009, 2010, 2011 Intel Corp.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Emmanuele Bassi <ebassi@linux.intel.com>
*/
/**
* SECTION:clutter-input-device
* @short_description: An input device managed by Clutter
*
* #ClutterInputDevice represents an input device known to Clutter.
*
* The #ClutterInputDevice class holds the state of the device, but
* its contents are usually defined by the Clutter backend in use.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-input-device.h"
#include "clutter-actor-private.h"
#include "clutter-debug.h"
#include "clutter-device-manager-private.h"
#include "clutter-enum-types.h"
#include "clutter-event-private.h"
#include "clutter-marshal.h"
#include "clutter-private.h"
#include "clutter-stage-private.h"
#include <math.h>
enum
{
PROP_0,
PROP_BACKEND,
PROP_ID,
PROP_NAME,
PROP_DEVICE_TYPE,
PROP_DEVICE_MANAGER,
PROP_DEVICE_MODE,
PROP_HAS_CURSOR,
PROP_ENABLED,
PROP_N_AXES,
PROP_LAST
};
static void _clutter_input_device_free_touch_info (gpointer data);
static GParamSpec *obj_props[PROP_LAST] = { NULL, };
G_DEFINE_TYPE (ClutterInputDevice, clutter_input_device, G_TYPE_OBJECT);
static void
clutter_input_device_dispose (GObject *gobject)
{
ClutterInputDevice *device = CLUTTER_INPUT_DEVICE (gobject);
g_clear_pointer (&device->device_name, g_free);
if (device->associated != NULL)
{
if (device->device_mode == CLUTTER_INPUT_MODE_SLAVE)
_clutter_input_device_remove_slave (device->associated, device);
_clutter_input_device_set_associated_device (device->associated, NULL);
g_object_unref (device->associated);
device->associated = NULL;
}
g_clear_pointer (&device->axes, g_array_unref);
g_clear_pointer (&device->keys, g_array_unref);
g_clear_pointer (&device->scroll_info, g_array_unref);
g_clear_pointer (&device->touch_sequences_info, g_hash_table_unref);
if (device->inv_touch_sequence_actors)
{
GHashTableIter iter;
gpointer key, value;
g_hash_table_iter_init (&iter, device->inv_touch_sequence_actors);
while (g_hash_table_iter_next (&iter, &key, &value))
g_list_free (value);
g_hash_table_unref (device->inv_touch_sequence_actors);
device->inv_touch_sequence_actors = NULL;
}
G_OBJECT_CLASS (clutter_input_device_parent_class)->dispose (gobject);
}
static void
clutter_input_device_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ClutterInputDevice *self = CLUTTER_INPUT_DEVICE (gobject);
switch (prop_id)
{
case PROP_ID:
self->id = g_value_get_int (value);
break;
case PROP_DEVICE_TYPE:
self->device_type = g_value_get_enum (value);
break;
case PROP_DEVICE_MANAGER:
self->device_manager = g_value_get_object (value);
break;
case PROP_DEVICE_MODE:
self->device_mode = g_value_get_enum (value);
break;
case PROP_BACKEND:
self->backend = g_value_get_object (value);
break;
case PROP_NAME:
self->device_name = g_value_dup_string (value);
break;
case PROP_HAS_CURSOR:
self->has_cursor = g_value_get_boolean (value);
break;
case PROP_ENABLED:
clutter_input_device_set_enabled (self, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_input_device_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ClutterInputDevice *self = CLUTTER_INPUT_DEVICE (gobject);
switch (prop_id)
{
case PROP_ID:
g_value_set_int (value, self->id);
break;
case PROP_DEVICE_TYPE:
g_value_set_enum (value, self->device_type);
break;
case PROP_DEVICE_MANAGER:
g_value_set_object (value, self->device_manager);
break;
case PROP_DEVICE_MODE:
g_value_set_enum (value, self->device_mode);
break;
case PROP_BACKEND:
g_value_set_object (value, self->backend);
break;
case PROP_NAME:
g_value_set_string (value, self->device_name);
break;
case PROP_HAS_CURSOR:
g_value_set_boolean (value, self->has_cursor);
break;
case PROP_N_AXES:
g_value_set_uint (value, clutter_input_device_get_n_axes (self));
break;
case PROP_ENABLED:
g_value_set_boolean (value, self->is_enabled);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
clutter_input_device_class_init (ClutterInputDeviceClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
/**
* ClutterInputDevice:id:
*
* The unique identifier of the device
*
* Since: 1.2
*/
obj_props[PROP_ID] =
g_param_spec_int ("id",
P_("Id"),
P_("Unique identifier of the device"),
-1, G_MAXINT,
0,
CLUTTER_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY);
/**
* ClutterInputDevice:name:
*
* The name of the device
*
* Since: 1.2
*/
obj_props[PROP_NAME] =
g_param_spec_string ("name",
P_("Name"),
P_("The name of the device"),
NULL,
CLUTTER_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY);
/**
* ClutterInputDevice:device-type:
*
* The type of the device
*
* Since: 1.2
*/
obj_props[PROP_DEVICE_TYPE] =
g_param_spec_enum ("device-type",
P_("Device Type"),
P_("The type of the device"),
CLUTTER_TYPE_INPUT_DEVICE_TYPE,
CLUTTER_POINTER_DEVICE,
CLUTTER_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY);
/**
* ClutterInputDevice:device-manager:
*
* The #ClutterDeviceManager instance which owns the device
*
* Since: 1.6
*/
obj_props[PROP_DEVICE_MANAGER] =
g_param_spec_object ("device-manager",
P_("Device Manager"),
P_("The device manager instance"),
CLUTTER_TYPE_DEVICE_MANAGER,
CLUTTER_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
/**
* ClutterInputDevice:mode:
*
* The mode of the device.
*
* Since: 1.6
*/
obj_props[PROP_DEVICE_MODE] =
g_param_spec_enum ("device-mode",
P_("Device Mode"),
P_("The mode of the device"),
CLUTTER_TYPE_INPUT_MODE,
CLUTTER_INPUT_MODE_FLOATING,
CLUTTER_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
/**
* ClutterInputDevice:has-cursor:
*
* Whether the device has an on screen cursor following its movement.
*
* Since: 1.6
*/
obj_props[PROP_HAS_CURSOR] =
g_param_spec_boolean ("has-cursor",
P_("Has Cursor"),
P_("Whether the device has a cursor"),
FALSE,
CLUTTER_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
/**
* ClutterInputDevice:enabled:
*
* Whether the device is enabled.
*
* A device with the #ClutterInputDevice:device-mode property set
* to %CLUTTER_INPUT_MODE_MASTER cannot be disabled.
*
* A device must be enabled in order to receive events from it.
*
* Since: 1.6
*/
obj_props[PROP_ENABLED] =
g_param_spec_boolean ("enabled",
P_("Enabled"),
P_("Whether the device is enabled"),
FALSE,
CLUTTER_PARAM_READWRITE);
/**
* ClutterInputDevice:n-axes:
*
* The number of axes of the device.
*
* Since: 1.6
*/
obj_props[PROP_N_AXES] =
g_param_spec_uint ("n-axes",
P_("Number of Axes"),
P_("The number of axes on the device"),
0, G_MAXUINT,
0,
CLUTTER_PARAM_READABLE);
/**
* ClutterInputDevice:backend:
*
* The #ClutterBackend that created the device.
*
* Since: 1.6
*/
obj_props[PROP_BACKEND] =
g_param_spec_object ("backend",
P_("Backend"),
P_("The backend instance"),
CLUTTER_TYPE_BACKEND,
CLUTTER_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
gobject_class->dispose = clutter_input_device_dispose;
gobject_class->set_property = clutter_input_device_set_property;
gobject_class->get_property = clutter_input_device_get_property;
g_object_class_install_properties (gobject_class, PROP_LAST, obj_props);
}
static void
clutter_input_device_init (ClutterInputDevice *self)
{
self->id = -1;
self->device_type = CLUTTER_POINTER_DEVICE;
self->click_count = 0;
self->current_time = self->previous_time = CLUTTER_CURRENT_TIME;
self->current_x = self->previous_x = -1;
self->current_y = self->previous_y = -1;
self->current_button_number = self->previous_button_number = -1;
self->current_state = self->previous_state = 0;
self->touch_sequences_info =
g_hash_table_new_full (NULL, NULL,
NULL, _clutter_input_device_free_touch_info);
self->inv_touch_sequence_actors = g_hash_table_new (NULL, NULL);
}
static ClutterTouchInfo *
_clutter_input_device_ensure_touch_info (ClutterInputDevice *device,
ClutterEventSequence *sequence,
ClutterStage *stage)
{
ClutterTouchInfo *info;
info = g_hash_table_lookup (device->touch_sequences_info, sequence);
if (info == NULL)
{
info = g_slice_new0 (ClutterTouchInfo);
info->sequence = sequence;
g_hash_table_insert (device->touch_sequences_info, sequence, info);
if (g_hash_table_size (device->touch_sequences_info) == 1)
_clutter_input_device_set_stage (device, stage);
}
return info;
}
/*< private >
* clutter_input_device_set_coords:
* @device: a #ClutterInputDevice
* @sequence: a #ClutterEventSequence or NULL
* @x: X coordinate of the device
* @y: Y coordinate of the device
*
* Stores the last known coordinates of the device
*/
void
_clutter_input_device_set_coords (ClutterInputDevice *device,
ClutterEventSequence *sequence,
gfloat x,
gfloat y,
ClutterStage *stage)
{
g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));
if (sequence == NULL)
{
if (device->current_x != x)
device->current_x = x;
if (device->current_y != y)
device->current_y = y;
}
else
{
ClutterTouchInfo *info;
info = _clutter_input_device_ensure_touch_info (device, sequence, stage);
info->current_x = x;
info->current_y = y;
}
}
/*< private >
* clutter_input_device_set_state:
* @device: a #ClutterInputDevice
* @state: a bitmask of modifiers
*
* Stores the last known modifiers state of the device
*/
void
_clutter_input_device_set_state (ClutterInputDevice *device,
ClutterModifierType state)
{
g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));
device->current_state = state;
}
/**
* clutter_input_device_get_modifier_state:
* @device: a #ClutterInputDevice
*
* Retrieves the current modifiers state of the device, as seen
* by the last event Clutter processed.
*
* Return value: the last known modifier state
*
* Since: 1.16
*/
ClutterModifierType
clutter_input_device_get_modifier_state (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), 0);
return device->current_state;
}
/*< private >
* clutter_input_device_set_time:
* @device: a #ClutterInputDevice
* @time_: the time
*
* Stores the last known event time of the device
*/
void
_clutter_input_device_set_time (ClutterInputDevice *device,
guint32 time_)
{
g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));
if (device->current_time != time_)
device->current_time = time_;
}
/*< private >
* clutter_input_device_set_stage:
* @device: a #ClutterInputDevice
* @stage: a #ClutterStage or %NULL
*
* Stores the stage under the device
*/
void
_clutter_input_device_set_stage (ClutterInputDevice *device,
ClutterStage *stage)
{
if (device->stage == stage)
return;
device->stage = stage;
/* we leave the ->cursor_actor in place in order to check
* if we left the stage without crossing it again; this way
* we can emit a leave event on the cursor actor right before
* we emit the leave event on the stage.
*/
}
/*< private >
* clutter_input_device_get_stage:
* @device: a #ClutterInputDevice
*
* Retrieves the stage currently associated with @device.
*
* Return value: The stage currently associated with @device.
*/
ClutterStage *
_clutter_input_device_get_stage (ClutterInputDevice *device)
{
return device->stage;
}
static void
_clutter_input_device_free_touch_info (gpointer data)
{
g_slice_free (ClutterTouchInfo, data);
}
static ClutterActor *
_clutter_input_device_get_actor (ClutterInputDevice *device,
ClutterEventSequence *sequence)
{
ClutterTouchInfo *info;
if (sequence == NULL)
return device->cursor_actor;
info = g_hash_table_lookup (device->touch_sequences_info, sequence);
return info->actor;
}
static void on_cursor_actor_destroy (ClutterActor *actor,
ClutterInputDevice *device);
static void
_clutter_input_device_associate_actor (ClutterInputDevice *device,
ClutterEventSequence *sequence,
ClutterActor *actor)
{
if (sequence == NULL)
device->cursor_actor = actor;
else
{
GList *sequences =
g_hash_table_lookup (device->inv_touch_sequence_actors, actor);
ClutterTouchInfo *info;
ClutterStage *stage = CLUTTER_STAGE (clutter_actor_get_stage (actor));
info = _clutter_input_device_ensure_touch_info (device, sequence, stage);
info->actor = actor;
g_hash_table_insert (device->inv_touch_sequence_actors,
actor, g_list_prepend (sequences, sequence));
}
g_signal_connect (actor,
"destroy", G_CALLBACK (on_cursor_actor_destroy),
device);
_clutter_actor_set_has_pointer (actor, TRUE);
}
static void
_clutter_input_device_unassociate_actor (ClutterInputDevice *device,
ClutterActor *actor,
gboolean destroyed)
{
if (device->cursor_actor == actor)
device->cursor_actor = NULL;
else
{
GList *l, *sequences =
g_hash_table_lookup (device->inv_touch_sequence_actors,
actor);
for (l = sequences; l != NULL; l = l->next)
{
ClutterTouchInfo *info =
g_hash_table_lookup (device->touch_sequences_info, l->data);
if (info)
info->actor = NULL;
}
g_list_free (sequences);
g_hash_table_remove (device->inv_touch_sequence_actors, actor);
}
if (destroyed == FALSE)
{
g_signal_handlers_disconnect_by_func (actor,
G_CALLBACK (on_cursor_actor_destroy),
device);
_clutter_actor_set_has_pointer (actor, FALSE);
}
}
static void
on_cursor_actor_destroy (ClutterActor *actor,
ClutterInputDevice *device)
{
_clutter_input_device_unassociate_actor (device, actor, TRUE);
}
/*< private >
* clutter_input_device_set_actor:
* @device: a #ClutterInputDevice
* @actor: a #ClutterActor
* @emit_crossing: %TRUE to emit crossing events
*
* Sets the actor under the pointer coordinates of @device
*
* This function is called by _clutter_input_device_update()
* and it will:
*
* - queue a %CLUTTER_LEAVE event on the previous pointer actor
* of @device, if any
* - set to %FALSE the :has-pointer property of the previous
* pointer actor of @device, if any
* - queue a %CLUTTER_ENTER event on the new pointer actor
* - set to %TRUE the :has-pointer property of the new pointer
* actor
*/
void
_clutter_input_device_set_actor (ClutterInputDevice *device,
ClutterEventSequence *sequence,
ClutterActor *actor,
gboolean emit_crossing)
{
ClutterActor *old_actor = _clutter_input_device_get_actor (device, sequence);
if (old_actor == actor)
return;
if (old_actor != NULL)
{
ClutterActor *tmp_old_actor;
if (emit_crossing)
{
ClutterEvent *event;
event = clutter_event_new (CLUTTER_LEAVE);
event->crossing.time = device->current_time;
event->crossing.flags = 0;
event->crossing.stage = device->stage;
event->crossing.source = old_actor;
event->crossing.x = device->current_x;
event->crossing.y = device->current_y;
event->crossing.related = actor;
clutter_event_set_device (event, device);
/* we need to make sure that this event is processed
* before any other event we might have queued up until
* now, so we go on, and synthesize the event emission
* ourselves
*/
_clutter_process_event (event);
clutter_event_free (event);
}
/* processing the event might have destroyed the actor */
tmp_old_actor = _clutter_input_device_get_actor (device, sequence);
_clutter_input_device_unassociate_actor (device,
old_actor,
tmp_old_actor == NULL);
old_actor = tmp_old_actor;
}
if (actor != NULL)
{
_clutter_input_device_associate_actor (device, sequence, actor);
if (emit_crossing)
{
ClutterEvent *event;
event = clutter_event_new (CLUTTER_ENTER);
event->crossing.time = device->current_time;
event->crossing.flags = 0;
event->crossing.stage = device->stage;
event->crossing.x = device->current_x;
event->crossing.y = device->current_y;
event->crossing.source = actor;
event->crossing.related = old_actor;
clutter_event_set_device (event, device);
/* see above */
_clutter_process_event (event);
clutter_event_free (event);
}
}
}
/**
* clutter_input_device_get_device_type:
* @device: a #ClutterInputDevice
*
* Retrieves the type of @device
*
* Return value: the type of the device
*
* Since: 1.0
*/
ClutterInputDeviceType
clutter_input_device_get_device_type (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device),
CLUTTER_POINTER_DEVICE);
return device->device_type;
}
/**
* clutter_input_device_get_device_id:
* @device: a #ClutterInputDevice
*
* Retrieves the unique identifier of @device
*
* Return value: the identifier of the device
*
* Since: 1.0
*/
gint
clutter_input_device_get_device_id (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), -1);
return device->id;
}
/**
* clutter_input_device_set_enabled:
* @device: a #ClutterInputDevice
* @enabled: %TRUE to enable the @device
*
* Enables or disables a #ClutterInputDevice.
*
* Only devices with a #ClutterInputDevice:device-mode property set
* to %CLUTTER_INPUT_MODE_SLAVE or %CLUTTER_INPUT_MODE_FLOATING can
* be disabled.
*
* Since: 1.6
*/
void
clutter_input_device_set_enabled (ClutterInputDevice *device,
gboolean enabled)
{
g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));
enabled = !!enabled;
if (!enabled && device->device_mode == CLUTTER_INPUT_MODE_MASTER)
return;
if (device->is_enabled == enabled)
return;
device->is_enabled = enabled;
g_object_notify_by_pspec (G_OBJECT (device), obj_props[PROP_ENABLED]);
}
/**
* clutter_input_device_get_enabled:
* @device: a #ClutterInputDevice
*
* Retrieves whether @device is enabled.
*
* Return value: %TRUE if the device is enabled
*
* Since: 1.6
*/
gboolean
clutter_input_device_get_enabled (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), FALSE);
return device->is_enabled;
}
/**
* clutter_input_device_get_coords:
* @device: a #ClutterInputDevice
* @sequence: (allow-none): a #ClutterEventSequence, or %NULL if
* the device is not touch-based
* @point: (out caller-allocates): return location for the pointer
* or touch point
*
* Retrieves the latest coordinates of a pointer or touch point of
* @device.
*
* Return value: %FALSE if the device's sequence hasn't been found,
* and %TRUE otherwise.
*
* Since: 1.12
*/
gboolean
clutter_input_device_get_coords (ClutterInputDevice *device,
ClutterEventSequence *sequence,
ClutterPoint *point)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), FALSE);
g_return_val_if_fail (point != NULL, FALSE);
if (sequence == NULL)
{
point->x = device->current_x;
point->y = device->current_y;
}
else
{
ClutterTouchInfo *info =
g_hash_table_lookup (device->touch_sequences_info, sequence);
if (info == NULL)
return FALSE;
point->x = info->current_x;
point->y = info->current_y;
}
return TRUE;
}
/*
* _clutter_input_device_update:
* @device: a #ClutterInputDevice
*
* Updates the input @device by determining the #ClutterActor underneath the
* pointer's cursor
*
* This function calls _clutter_input_device_set_actor() if needed.
*
* This function only works for #ClutterInputDevice of type
* %CLUTTER_POINTER_DEVICE.
*
* Since: 1.2
*/
ClutterActor *
_clutter_input_device_update (ClutterInputDevice *device,
ClutterEventSequence *sequence,
gboolean emit_crossing)
{
ClutterStage *stage;
ClutterActor *new_cursor_actor;
ClutterActor *old_cursor_actor;
ClutterPoint point = { -1, -1 };
if (device->device_type == CLUTTER_KEYBOARD_DEVICE)
return NULL;
stage = device->stage;
if (G_UNLIKELY (stage == NULL))
{
CLUTTER_NOTE (EVENT, "No stage defined for device %d '%s'",
clutter_input_device_get_device_id (device),
clutter_input_device_get_device_name (device));
return NULL;
}
clutter_input_device_get_coords (device, sequence, &point);
old_cursor_actor = _clutter_input_device_get_actor (device, sequence);
new_cursor_actor =
_clutter_stage_do_pick (stage, point.x, point.y, CLUTTER_PICK_REACTIVE);
/* if the pick could not find an actor then we do not update the
* input device, to avoid ghost enter/leave events; the pick should
* never fail, except for bugs in the glReadPixels() implementation
* in which case this is the safest course of action anyway
*/
if (new_cursor_actor == NULL)
return NULL;
CLUTTER_NOTE (EVENT,
"Actor under cursor (device %d, at %.2f, %.2f): %s",
clutter_input_device_get_device_id (device),
point.x,
point.y,
_clutter_actor_get_debug_name (new_cursor_actor));
/* short-circuit here */
if (new_cursor_actor == old_cursor_actor)
return old_cursor_actor;
_clutter_input_device_set_actor (device, sequence,
new_cursor_actor,
emit_crossing);
return new_cursor_actor;
}
/**
* clutter_input_device_get_pointer_actor:
* @device: a #ClutterInputDevice of type %CLUTTER_POINTER_DEVICE
*
* Retrieves the #ClutterActor underneath the pointer of @device
*
* Return value: (transfer none): a pointer to the #ClutterActor or %NULL
*
* Since: 1.2
*/
ClutterActor *
clutter_input_device_get_pointer_actor (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), NULL);
g_return_val_if_fail (device->device_type == CLUTTER_POINTER_DEVICE, NULL);
return device->cursor_actor;
}
/**
* clutter_input_device_get_pointer_stage:
* @device: a #ClutterInputDevice of type %CLUTTER_POINTER_DEVICE
*
* Retrieves the #ClutterStage underneath the pointer of @device
*
* Return value: (transfer none): a pointer to the #ClutterStage or %NULL
*
* Since: 1.2
*/
ClutterStage *
clutter_input_device_get_pointer_stage (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), NULL);
g_return_val_if_fail (device->device_type == CLUTTER_POINTER_DEVICE, NULL);
return device->stage;
}
/**
* clutter_input_device_get_device_name:
* @device: a #ClutterInputDevice
*
* Retrieves the name of the @device
*
* Return value: the name of the device, or %NULL. The returned string
* is owned by the #ClutterInputDevice and should never be modified
* or freed
*
* Since: 1.2
*/
const gchar *
clutter_input_device_get_device_name (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), NULL);
return device->device_name;
}
/**
* clutter_input_device_get_has_cursor:
* @device: a #ClutterInputDevice
*
* Retrieves whether @device has a pointer that follows the
* device motion.
*
* Return value: %TRUE if the device has a cursor
*
* Since: 1.6
*/
gboolean
clutter_input_device_get_has_cursor (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), FALSE);
return device->has_cursor;
}
/**
* clutter_input_device_get_device_mode:
* @device: a #ClutterInputDevice
*
* Retrieves the #ClutterInputMode of @device.
*
* Return value: the device mode
*
* Since: 1.6
*/
ClutterInputMode
clutter_input_device_get_device_mode (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device),
CLUTTER_INPUT_MODE_FLOATING);
return device->device_mode;
}
/**
* clutter_input_device_update_from_event:
* @device: a #ClutterInputDevice
* @event: a #ClutterEvent
* @update_stage: whether to update the #ClutterStage of the @device
* using the stage of the event
*
* Forcibly updates the state of the @device using a #ClutterEvent
*
* This function should never be used by applications: it is meant
* for integration with embedding toolkits, like clutter-gtk
*
* Embedding toolkits that disable the event collection inside Clutter
* need to use this function to update the state of input devices depending
* on a #ClutterEvent that they are going to submit to the event handling code
* in Clutter though clutter_do_event(). Since the input devices hold the state
* that is going to be used to fill in fields like the #ClutterButtonEvent
* click count, or to emit synthesized events like %CLUTTER_ENTER and
* %CLUTTER_LEAVE, it is necessary for embedding toolkits to also be
* responsible of updating the input device state.
*
* For instance, this might be the code to translate an embedding toolkit
* native motion notification into a Clutter #ClutterMotionEvent and ask
* Clutter to process it:
*
* |[
* ClutterEvent c_event;
*
* translate_native_event_to_clutter (native_event, &c_event);
*
* clutter_do_event (&c_event);
* ]|
*
* Before letting clutter_do_event() process the event, it is necessary to call
* clutter_input_device_update_from_event():
*
* |[
* ClutterEvent c_event;
* ClutterDeviceManager *manager;
* ClutterInputDevice *device;
*
* translate_native_event_to_clutter (native_event, &c_event);
*
* // get the device manager
* manager = clutter_device_manager_get_default ();
*
* // use the default Core Pointer that Clutter backends register by default
* device = clutter_device_manager_get_core_device (manager, %CLUTTER_POINTER_DEVICE);
*
* // update the state of the input device
* clutter_input_device_update_from_event (device, &c_event, FALSE);
*
* clutter_do_event (&c_event);
* ]|
*
* The @update_stage boolean argument should be used when the input device
* enters and leaves a #ClutterStage; it will use the #ClutterStage field
* of the passed @event to update the stage associated to the input device.
*
* Since: 1.2
*/
void
clutter_input_device_update_from_event (ClutterInputDevice *device,
ClutterEvent *event,
gboolean update_stage)
{
ClutterModifierType event_state;
ClutterEventSequence *sequence;
ClutterStage *event_stage;
gfloat event_x, event_y;
guint32 event_time;
g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));
g_return_if_fail (event != NULL);
event_state = clutter_event_get_state (event);
event_time = clutter_event_get_time (event);
event_stage = clutter_event_get_stage (event);
sequence = clutter_event_get_event_sequence (event);
clutter_event_get_coords (event, &event_x, &event_y);
_clutter_input_device_set_coords (device, sequence, event_x, event_y, event_stage);
_clutter_input_device_set_state (device, event_state);
_clutter_input_device_set_time (device, event_time);
if (update_stage)
_clutter_input_device_set_stage (device, event_stage);
}
/*< private >
* clutter_input_device_reset_axes:
* @device: a #ClutterInputDevice
*
* Resets the axes on @device
*/
void
_clutter_input_device_reset_axes (ClutterInputDevice *device)
{
if (device->axes != NULL)
{
g_array_free (device->axes, TRUE);
device->axes = NULL;
g_object_notify_by_pspec (G_OBJECT (device), obj_props[PROP_N_AXES]);
}
}
/*< private >
* clutter_input_device_add_axis:
* @device: a #ClutterInputDevice
* @axis: the axis type
* @minimum: the minimum axis value
* @maximum: the maximum axis value
* @resolution: the axis resolution
*
* Adds an axis of type @axis on @device.
*/
guint
_clutter_input_device_add_axis (ClutterInputDevice *device,
ClutterInputAxis axis,
gdouble minimum,
gdouble maximum,
gdouble resolution)
{
ClutterAxisInfo info;
guint pos;
if (device->axes == NULL)
device->axes = g_array_new (FALSE, TRUE, sizeof (ClutterAxisInfo));
info.axis = axis;
info.min_value = minimum;
info.max_value = maximum;
info.resolution = resolution;
switch (axis)
{
case CLUTTER_INPUT_AXIS_X:
case CLUTTER_INPUT_AXIS_Y:
info.min_axis = 0;
info.max_axis = 0;
break;
case CLUTTER_INPUT_AXIS_XTILT:
case CLUTTER_INPUT_AXIS_YTILT:
info.min_axis = -1;
info.max_axis = 1;
break;
default:
info.min_axis = 0;
info.max_axis = 1;
break;
}
device->axes = g_array_append_val (device->axes, info);
pos = device->axes->len - 1;
g_object_notify_by_pspec (G_OBJECT (device), obj_props[PROP_N_AXES]);
return pos;
}
/*< private >
* clutter_input_translate_axis:
* @device: a #ClutterInputDevice
* @index_: the index of the axis
* @gint: the absolute value of the axis
* @axis_value: (out): the translated value of the axis
*
* Performs a conversion from the absolute value of the axis
* to a relative value.
*
* The axis at @index_ must not be %CLUTTER_INPUT_AXIS_X or
* %CLUTTER_INPUT_AXIS_Y.
*
* Return value: %TRUE if the conversion was successful
*/
gboolean
_clutter_input_device_translate_axis (ClutterInputDevice *device,
guint index_,
gdouble value,
gdouble *axis_value)
{
ClutterAxisInfo *info;
gdouble width;
gdouble real_value;
if (device->axes == NULL || index_ >= device->axes->len)
return FALSE;
info = &g_array_index (device->axes, ClutterAxisInfo, index_);
if (info->axis == CLUTTER_INPUT_AXIS_X ||
info->axis == CLUTTER_INPUT_AXIS_Y)
return FALSE;
if (fabs (info->max_value - info->min_value) < 0.0000001)
return FALSE;
width = info->max_value - info->min_value;
real_value = (info->max_axis * (value - info->min_value)
+ info->min_axis * (info->max_value - value))
/ width;
if (axis_value)
*axis_value = real_value;
return TRUE;
}
/**
* clutter_input_device_get_axis:
* @device: a #ClutterInputDevice
* @index_: the index of the axis
*
* Retrieves the type of axis on @device at the given index.
*
* Return value: the axis type
*
* Since: 1.6
*/
ClutterInputAxis
clutter_input_device_get_axis (ClutterInputDevice *device,
guint index_)
{
ClutterAxisInfo *info;
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device),
CLUTTER_INPUT_AXIS_IGNORE);
if (device->axes == NULL)
return CLUTTER_INPUT_AXIS_IGNORE;
if (index_ >= device->axes->len)
return CLUTTER_INPUT_AXIS_IGNORE;
info = &g_array_index (device->axes, ClutterAxisInfo, index_);
return info->axis;
}
/**
* clutter_input_device_get_axis_value:
* @device: a #ClutterInputDevice
* @axes: (array): an array of axes values, typically
* coming from clutter_event_get_axes()
* @axis: the axis to extract
* @value: (out): return location for the axis value
*
* Extracts the value of the given @axis of a #ClutterInputDevice from
* an array of axis values.
*
* An example of typical usage for this function is:
*
* |[
* ClutterInputDevice *device = clutter_event_get_device (event);
* gdouble *axes = clutter_event_get_axes (event, NULL);
* gdouble pressure_value = 0;
*
* clutter_input_device_get_axis_value (device, axes,
* CLUTTER_INPUT_AXIS_PRESSURE,
* &pressure_value);
* ]|
*
* Return value: %TRUE if the value was set, and %FALSE otherwise
*
* Since: 1.6
*/
gboolean
clutter_input_device_get_axis_value (ClutterInputDevice *device,
gdouble *axes,
ClutterInputAxis axis,
gdouble *value)
{
gint i;
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), FALSE);
g_return_val_if_fail (device->axes != NULL, FALSE);
for (i = 0; i < device->axes->len; i++)
{
ClutterAxisInfo *info;
info = &g_array_index (device->axes, ClutterAxisInfo, i);
if (info->axis == axis)
{
if (value)
*value = axes[i];
return TRUE;
}
}
return FALSE;
}
/**
* clutter_input_device_get_n_axes:
* @device: a #ClutterInputDevice
*
* Retrieves the number of axes available on @device.
*
* Return value: the number of axes on the device
*
* Since: 1.6
*/
guint
clutter_input_device_get_n_axes (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), 0);
if (device->axes != NULL)
return device->axes->len;
return 0;
}
/*< private >
* clutter_input_device_set_n_keys:
* @device: a #ClutterInputDevice
* @n_keys: the number of keys of the device
*
* Initializes the keys of @device.
*
* Call clutter_input_device_set_key() on each key to set the keyval
* and modifiers.
*/
void
_clutter_input_device_set_n_keys (ClutterInputDevice *device,
guint n_keys)
{
if (device->keys != NULL)
g_array_free (device->keys, TRUE);
device->n_keys = n_keys;
device->keys = g_array_sized_new (FALSE, TRUE,
sizeof (ClutterKeyInfo),
n_keys);
}
/**
* clutter_input_device_get_n_keys:
* @device: a #ClutterInputDevice
*
* Retrieves the number of keys registered for @device.
*
* Return value: the number of registered keys
*
* Since: 1.6
*/
guint
clutter_input_device_get_n_keys (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), 0);
return device->n_keys;
}
/**
* clutter_input_device_set_key:
* @device: a #ClutterInputDevice
* @index_: the index of the key
* @keyval: the keyval
* @modifiers: a bitmask of modifiers
*
* Sets the keyval and modifiers at the given @index_ for @device.
*
* Clutter will use the keyval and modifiers set when filling out
* an event coming from the same input device.
*
* Since: 1.6
*/
void
clutter_input_device_set_key (ClutterInputDevice *device,
guint index_,
guint keyval,
ClutterModifierType modifiers)
{
ClutterKeyInfo *key_info;
g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));
g_return_if_fail (index_ < device->n_keys);
key_info = &g_array_index (device->keys, ClutterKeyInfo, index_);
key_info->keyval = keyval;
key_info->modifiers = modifiers;
}
/**
* clutter_input_device_get_key:
* @device: a #ClutterInputDevice
* @index_: the index of the key
* @keyval: (out): return location for the keyval at @index_
* @modifiers: (out): return location for the modifiers at @index_
*
* Retrieves the key set using clutter_input_device_set_key()
*
* Return value: %TRUE if a key was set at the given index
*
* Since: 1.6
*/
gboolean
clutter_input_device_get_key (ClutterInputDevice *device,
guint index_,
guint *keyval,
ClutterModifierType *modifiers)
{
ClutterKeyInfo *key_info;
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), FALSE);
if (device->keys == NULL)
return FALSE;
if (index_ > device->keys->len)
return FALSE;
key_info = &g_array_index (device->keys, ClutterKeyInfo, index_);
if (!key_info->keyval && !key_info->modifiers)
return FALSE;
if (keyval)
*keyval = key_info->keyval;
if (modifiers)
*modifiers = key_info->modifiers;
return TRUE;
}
/*< private >
* clutter_input_device_add_slave:
* @master: a #ClutterInputDevice
* @slave: a #ClutterInputDevice
*
* Adds @slave to the list of slave devices of @master
*
* This function does not increase the reference count of either @master
* or @slave.
*/
void
_clutter_input_device_add_slave (ClutterInputDevice *master,
ClutterInputDevice *slave)
{
if (g_list_find (master->slaves, slave) == NULL)
master->slaves = g_list_prepend (master->slaves, slave);
}
/*< private >
* clutter_input_device_remove_slave:
* @master: a #ClutterInputDevice
* @slave: a #ClutterInputDevice
*
* Removes @slave from the list of slave devices of @master.
*
* This function does not decrease the reference count of either @master
* or @slave.
*/
void
_clutter_input_device_remove_slave (ClutterInputDevice *master,
ClutterInputDevice *slave)
{
if (g_list_find (master->slaves, slave) != NULL)
master->slaves = g_list_remove (master->slaves, slave);
}
/*< private >
* clutter_input_device_add_sequence:
* @device: a #ClutterInputDevice
* @sequence: a #ClutterEventSequence
*
* Start tracking informations related to a touch point (position,
* actor underneath the touch point).
*/
void
_clutter_input_device_add_event_sequence (ClutterInputDevice *device,
ClutterEvent *event)
{
ClutterEventSequence *sequence = clutter_event_get_event_sequence (event);
ClutterStage *stage;
if (sequence == NULL)
return;
stage = clutter_event_get_stage (event);
if (stage == NULL)
return;
_clutter_input_device_ensure_touch_info (device, sequence, stage);
}
/*< private >
* clutter_input_device_remove_sequence:
* @device: a #ClutterInputDevice
* @sequence: a #ClutterEventSequence
*
* Stop tracking informations related to a touch point.
*/
void
_clutter_input_device_remove_event_sequence (ClutterInputDevice *device,
ClutterEvent *event)
{
ClutterEventSequence *sequence = clutter_event_get_event_sequence (event);
ClutterTouchInfo *info =
g_hash_table_lookup (device->touch_sequences_info, sequence);
if (info == NULL)
return;
if (info->actor != NULL)
{
GList *sequences =
g_hash_table_lookup (device->inv_touch_sequence_actors, info->actor);
sequences = g_list_remove (sequences, sequence);
g_hash_table_replace (device->inv_touch_sequence_actors,
info->actor, sequences);
_clutter_input_device_set_actor (device, sequence, NULL, TRUE);
}
g_hash_table_remove (device->touch_sequences_info, sequence);
}
/**
* clutter_input_device_get_slave_devices:
* @device: a #ClutterInputDevice
*
* Retrieves the slave devices attached to @device.
*
* Return value: (transfer container) (element-type Clutter.InputDevice): a
* list of #ClutterInputDevice, or %NULL. The contents of the list are
* owned by the device. Use g_list_free() when done
*
* Since: 1.6
*/
GList *
clutter_input_device_get_slave_devices (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), NULL);
return g_list_copy (device->slaves);
}
/*< internal >
* clutter_input_device_set_associated_device:
* @device: a #ClutterInputDevice
* @associated: (allow-none): a #ClutterInputDevice, or %NULL
*
* Sets the associated device for @device.
*
* This function keeps a reference on the associated device.
*/
void
_clutter_input_device_set_associated_device (ClutterInputDevice *device,
ClutterInputDevice *associated)
{
if (device->associated == associated)
return;
if (device->associated != NULL)
g_object_unref (device->associated);
device->associated = associated;
if (device->associated != NULL)
g_object_ref (device->associated);
CLUTTER_NOTE (MISC, "Associating device %d '%s' to device %d '%s'",
clutter_input_device_get_device_id (device),
clutter_input_device_get_device_name (device),
device->associated != NULL
? clutter_input_device_get_device_id (device->associated)
: -1,
device->associated != NULL
? clutter_input_device_get_device_name (device->associated)
: "(none)");
if (device->device_mode != CLUTTER_INPUT_MODE_MASTER)
{
if (device->associated != NULL)
device->device_mode = CLUTTER_INPUT_MODE_SLAVE;
else
device->device_mode = CLUTTER_INPUT_MODE_FLOATING;
g_object_notify_by_pspec (G_OBJECT (device), obj_props[PROP_DEVICE_MODE]);
}
}
/**
* clutter_input_device_get_associated_device:
* @device: a #ClutterInputDevice
*
* Retrieves a pointer to the #ClutterInputDevice that has been
* associated to @device.
*
* If the #ClutterInputDevice:device-mode property of @device is
* set to %CLUTTER_INPUT_MODE_MASTER, this function will return
* %NULL.
*
* Return value: (transfer none): a #ClutterInputDevice, or %NULL
*
* Since: 1.6
*/
ClutterInputDevice *
clutter_input_device_get_associated_device (ClutterInputDevice *device)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), NULL);
return device->associated;
}
/**
* clutter_input_device_keycode_to_evdev:
* @device: A #ClutterInputDevice
* @hardware_keycode: The hardware keycode from a #ClutterKeyEvent
* @evdev_keycode: The return location for the evdev keycode
*
* Translates a hardware keycode from a #ClutterKeyEvent to the
* equivalent evdev keycode. Note that depending on the input backend
* used by Clutter this function can fail if there is no obvious
* mapping between the key codes. The hardware keycode can be taken
* from the #ClutterKeyEvent.hardware_keycode member of #ClutterKeyEvent.
*
* Return value: %TRUE if the conversion succeeded, %FALSE otherwise.
*
* Since: 1.10
*/
gboolean
clutter_input_device_keycode_to_evdev (ClutterInputDevice *device,
guint hardware_keycode,
guint *evdev_keycode)
{
ClutterInputDeviceClass *device_class;
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), FALSE);
device_class = CLUTTER_INPUT_DEVICE_GET_CLASS (device);
if (device_class->keycode_to_evdev == NULL)
return FALSE;
else
return device_class->keycode_to_evdev (device,
hardware_keycode,
evdev_keycode);
}
void
_clutter_input_device_add_scroll_info (ClutterInputDevice *device,
guint index_,
ClutterScrollDirection direction,
gdouble increment)
{
ClutterScrollInfo info;
g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));
g_return_if_fail (index_ < clutter_input_device_get_n_axes (device));
info.axis_id = index_;
info.direction = direction;
info.increment = increment;
info.last_value_valid = FALSE;
if (device->scroll_info == NULL)
{
device->scroll_info = g_array_new (FALSE,
FALSE,
sizeof (ClutterScrollInfo));
}
g_array_append_val (device->scroll_info, info);
}
gboolean
_clutter_input_device_get_scroll_delta (ClutterInputDevice *device,
guint index_,
gdouble value,
ClutterScrollDirection *direction_p,
gdouble *delta_p)
{
guint i;
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), FALSE);
g_return_val_if_fail (index_ < clutter_input_device_get_n_axes (device), FALSE);
if (device->scroll_info == NULL)
return FALSE;
for (i = 0; i < device->scroll_info->len; i++)
{
ClutterScrollInfo *info = &g_array_index (device->scroll_info,
ClutterScrollInfo,
i);
if (info->axis_id == index_)
{
if (direction_p != NULL)
*direction_p = info->direction;
if (delta_p != NULL)
*delta_p = 0.0;
if (info->last_value_valid)
{
if (delta_p != NULL)
{
*delta_p = (value - info->last_value)
/ info->increment;
}
info->last_value = value;
}
else
{
info->last_value = value;
info->last_value_valid = TRUE;
}
return TRUE;
}
}
return FALSE;
}
void
_clutter_input_device_reset_scroll_info (ClutterInputDevice *device)
{
guint i;
if (device->scroll_info == NULL)
return;
for (i = 0; i < device->scroll_info->len; i++)
{
ClutterScrollInfo *info = &g_array_index (device->scroll_info,
ClutterScrollInfo,
i);
info->last_value_valid = FALSE;
}
}
static void
on_grab_sequence_actor_destroy (ClutterActor *actor,
ClutterInputDevice *device)
{
ClutterEventSequence *sequence =
g_hash_table_lookup (device->inv_sequence_grab_actors, actor);
if (sequence != NULL)
{
g_hash_table_remove (device->sequence_grab_actors, sequence);
g_hash_table_remove (device->inv_sequence_grab_actors, actor);
}
}
/**
* clutter_input_device_sequence_grab:
* @device: a #ClutterInputDevice
* @sequence: a #ClutterEventSequence
* @actor: a #ClutterActor
*
* Acquires a grab on @actor for the given @device and the given touch
* @sequence.
*
* Any touch event coming from @device and from @sequence will be
* delivered to @actor, bypassing the usual event delivery mechanism,
* until the grab is released by calling
* clutter_input_device_sequence_ungrab().
*
* The grab is client-side: even if the windowing system used by the Clutter
* backend has the concept of "device grabs", Clutter will not use them.
*
* Since: 1.12
*/
void
clutter_input_device_sequence_grab (ClutterInputDevice *device,
ClutterEventSequence *sequence,
ClutterActor *actor)
{
ClutterActor *grab_actor;
g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));
g_return_if_fail (CLUTTER_IS_ACTOR (actor));
if (device->sequence_grab_actors == NULL)
{
grab_actor = NULL;
device->sequence_grab_actors = g_hash_table_new (NULL, NULL);
device->inv_sequence_grab_actors = g_hash_table_new (NULL, NULL);
}
else
{
grab_actor = g_hash_table_lookup (device->sequence_grab_actors, sequence);
}
if (grab_actor != NULL)
{
g_signal_handlers_disconnect_by_func (grab_actor,
G_CALLBACK (on_grab_sequence_actor_destroy),
device);
g_hash_table_remove (device->sequence_grab_actors, sequence);
g_hash_table_remove (device->inv_sequence_grab_actors, grab_actor);
}
g_hash_table_insert (device->sequence_grab_actors, sequence, actor);
g_hash_table_insert (device->inv_sequence_grab_actors, actor, sequence);
g_signal_connect (actor,
"destroy",
G_CALLBACK (on_grab_sequence_actor_destroy),
device);
}
/**
* clutter_input_device_sequence_ungrab:
* @device: a #ClutterInputDevice
* @sequence: a #ClutterEventSequence
*
* Releases the grab on the @device for the given @sequence, if one is
* in place.
*
* Since: 1.12
*/
void
clutter_input_device_sequence_ungrab (ClutterInputDevice *device,
ClutterEventSequence *sequence)
{
ClutterActor *grab_actor;
g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));
if (device->sequence_grab_actors == NULL)
return;
grab_actor = g_hash_table_lookup (device->sequence_grab_actors, sequence);
if (grab_actor == NULL)
return;
g_signal_handlers_disconnect_by_func (grab_actor,
G_CALLBACK (on_grab_sequence_actor_destroy),
device);
g_hash_table_remove (device->sequence_grab_actors, sequence);
g_hash_table_remove (device->inv_sequence_grab_actors, grab_actor);
if (g_hash_table_size (device->sequence_grab_actors) == 0)
{
g_hash_table_destroy (device->sequence_grab_actors);
device->sequence_grab_actors = NULL;
g_hash_table_destroy (device->inv_sequence_grab_actors);
device->inv_sequence_grab_actors = NULL;
}
}
/**
* clutter_input_device_sequence_get_grabbed_actor:
* @device: a #ClutterInputDevice
* @sequence: a #ClutterEventSequence
*
* Retrieves a pointer to the #ClutterActor currently grabbing the
* touch events coming from @device given the @sequence.
*
* Return value: (transfer none): a #ClutterActor, or %NULL
*
* Since: 1.12
*/
ClutterActor *
clutter_input_device_sequence_get_grabbed_actor (ClutterInputDevice *device,
ClutterEventSequence *sequence)
{
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), NULL);
if (device->sequence_grab_actors == NULL)
return NULL;
return g_hash_table_lookup (device->sequence_grab_actors, sequence);
}
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